It will profit you absolutely nothing to take creationists seriously. The earth is 4.5 billion years old, the universe is 13.772 billion years old. Those who claim there is a lack of “proof” for this owe it to themselves and to people who may listen to them to invest some time and energy in understanding why it is 13.772 +/- 59 million years old. The +/- thing includes a good heap of understanding as to what the proof is and why it works the way it does.
Bear in mind that when dealing with issues such as this you are often contending with people who are not well studied or well practiced in either legal or scientific rules of evidence. Everyone has an opinion, not every opinion is a good one.
It is likely better that you should ask: how good am I at forming coherent, evidence-based opinions? Then attempt to answer the question honestly. Critical thinking may not be a fun skill to develop, but we contend with questions like this because it is so lacking.
Here are a few better things to think about that will profit you much more than worrying about creationists.
Tonight - go outside, use an iPhone app to help you if you have one, and gaze in the direction of the Sagittarius constellation. When you do, reflect on the fact that you are gazing at a giant black hole that astronomers call Sagittarius A* (read as: Sagittarius A-star, or Sagittarius A-prime). This is the “super” black hole at the center of the Milky Way galaxy, it is the mass of 2.5-4 billion of our suns.
As you gaze at this place in the sky, bear in mind that our entire solar system orbits this invisible giant - we orbit it as a solar system, the way our planet orbits the sun. We have a relationship with this enormous object, 26,000 light years away.
Then go inside and think about this. No matter how large and massive a black hole is, at its center lies a “singularity”.
A singularity is a point in space which - being a point, can be found in the sense that it is at a “point” in a 3-dimensional grid, i.e.: x, y, z, or length, width, height … there is a point where this singularity is found.
But the singularity, as a point, is a “point” more in the strict sense that they taught you to think about “points” in high school geometry. A geometric point, while we think of it as a dot, actually occupies no space at all. It is in space, but it occupies no space.
The singularity at the center of Sagittarius A*, like all singularities, has no volume. It has infinite mass, yet no volume.
We occupy the same universe with such things.
Finish your meditation by considering this: we understand that the Big Bang was a singularity. Whether it was the same kind of singularity as those found at the center of black holes is a question we cannot yet answer and probably never will be able to.
Nevertheless - when the Big Bang happened the universe “expanded” from the space of a singularity - in other words not really any space at all - to millions of light years in diameter, in the space of billionths of a second. Astronomers have a way of talking about this that uses too much math and causes people to visualize the wrong thing.
It is correct to say that in the beginning there was a singularity - but we don’t really have any idea what that is, other than a point of zero volume but infinite mass. It is also correct to say that the universe “expanded” in under a second to hundreds of millions of light years in diameter … only it is only correct to say this in the sense that a billionth of a second earlier, it essentially occupied no space at all.
Understanding this - it was much less a “bang”, than a “poof”. Count a second, right now. Now, visualize that in that time the universe went from nothing … to hundreds of millions of light years in diameter.
This kind of thinking will profit you. Listening to fundamentalists exploit people’s lack of critical thinking faculties is a waste of your time. You should look at it with the same disdain as a collections agent calling you every night to collect on someone else’s debt. It is an offense against you, or in this case: your time, and your mind.